Big Jake,
Thanks! Your suggestion was very helpful. I actually ended up modifying your approach a little bit. I tried using acetone and using a wire brush, but I don't know if I wasn't applying sufficient amounts of acetone, but it seemed that the acetone just evaporated and didn't have much of an effect on softening the plastic.
What I ended up doing was applying a thin layer of Squadron green putty, smoothed out with an applicator, then I used the wire brush you suggested, tapping on the putty. It ended up looking great!
Thanks again for your assistance and suggestion.
Happy Modeling!
Doug J.